JP2015101999A5 - - Google Patents

Description

The negative pressure pump according to claim 2 of the present invention has a bottomed cylindrical shape, the opening is closed by a lid, a lubricant is supplied to the inside, and a circular hole is formed at a position eccentric from the center of the casing of the bottom. And a support portion that is larger in diameter than the shaft portion and disposed in the case, and transmits power from a power source. A rotating shaft that rotates, and is disposed within the housing, and is supported by the support portion of the rotating shaft so as to be capable of reciprocating in a direction orthogonal to the rotating shaft, and rotates integrally with the rotating shaft and has an end portion. Three or more vanes that slide on the inner wall surface of the housing and divide the housing into a plurality of spaces, a suction portion that is formed in the housing and sucks gas into the housing, and the housing Formed on the downstream side in the rotation direction of the vane with respect to the suction portion of the body, and the gas sucked from the suction portion and A discharge portion that discharges the lubricant to the outside of the housing; and a bottom surface of the housing that is formed between the discharge portion and the suction portion in the rotation direction of the vane and communicates with the circular hole. And a recess for guiding the lubricant moved by the vane to the circular hole.

The negative pressure pump according to claim 6 of the present invention is the negative pressure pump according to claim 1 , wherein the vane is formed on an outer peripheral surface of the shaft portion, and the vane is in contact with the discharge portion and the support portion. A shaft-side groove that communicates between the recess and the outside of the housing when positioned between the first and second housings.

A cylinder head cover according to claim 8 of the present invention includes the negative pressure pump according to any one of claims 1-7, portions of which constitute the housing, as the other part the power source Cover the cylinder head of the engine.

As shown in FIGS. 1 and 2, a plate-like lid 38 is detachably attached to the opening 26 of the housing 20 (see FIG. 1). Sealing member (not shown) is disposed on the butt portion of the lid 38 and the housing 20. This seal member prevents the gas and lubricant in the housing 20 from leaking between the lid 38 and the housing 20 in a state where the lid 38 is mounted on the housing 20.

Moreover, in this embodiment, the housing | casing 20 is formed with resin. Specifically, the housing 20 is an integrally molded product of resin. As the resin forming the casing 20, either a thermosetting resin or a thermoplastic resin may be used. Examples of the thermosetting resin include phenol resins, urea resins, melamine resins, epoxy resins and the like. On the other hand, examples of the thermoplastic resin include urethane resins, olefin resins, vinyl chloride resins, polyacetal resins, polyamide resins, and polyimide resins. In this embodiment, the resin forming the housing 20 is a polyamide-based resin (for example, nylon) from the viewpoint of toughness and flexibility. Note that the present invention is not limited to this configuration, and the housing 20 may be formed of metal, but the housing 20 is preferably formed of resin from the viewpoint of weight and manufacturing cost.

The vane 50 rotates integrally with the rotating shaft 40, thereby reciprocating in the diametrical direction of the rotating shaft 40 due to centrifugal force, and the both end portions 50 B in the longitudinal direction are pressed against the inner wall surface 22 A of the housing 20. Slide on each. At this time, in the vane 50, one side portion 50C in the width direction slides on the closing surface of the lid body 38, and the other side portion in the width direction slides on the bottom surface 24A.

Further, the negative pressure pump 80, the shaft-side groove portion 84, since it is a helical swirling in the direction opposite to the vane rotation direction from the support portion 44 side toward the opposite side of the support portion 44, the rotary shaft 82 (the shaft portion 42), the force in the direction opposite to the vane rotation direction acts on the lubricant in the shaft-side groove 84. Thereby, the lubricant is guided to the outside of the housing 20 through the shaft side groove 84 and discharged.

The shaft side groove portion 84 of the present embodiment has a constant groove width and depth from one end on the support portion 44 side to the other end on the opposite side of the support portion 44, but the present invention is not limited to this configuration. At least one of the groove width and the groove depth of the shaft-side groove portion 84 may be changed from the one end to the other end.

In the negative pressure pump 80 of the present embodiment, the shaft-side groove portion 84 is configured to extend spirally along the outer peripheral surface 42A of the shaft portion 42, but the present invention is not limited to this configuration. For example, the shaft-side groove portion 84 may be configured to extend linearly along the axial direction of the rotary shaft 82 , or the shaft-side groove portion 84 may be configured to extend in a curved shape (as an example, a wave shape) in the axial direction of the rotary shaft 82. Good. Further, the shaft-side groove portion (including the shaft-side groove portion 84) may be configured to branch into a plurality on the way from the support portion 44 side to the opposite side of the support portion 44.

(Other embodiments)
As shown in FIG. 3, in the negative pressure pump 10 of the first embodiment, the support portion 44 of the rotating shaft 40 abuts a part of the inner wall surface 22 </ b> A of the housing 20 and supports one vane 50. However, the present invention is not limited to this configuration. For example, unlike the negative pressure pump 130 of the other embodiment shown in FIG. 14, the support part 134 of the rotating shaft 132 does not contact the inner wall surface 22A of the housing 20, and there are three or more support parts 134 (FIG. 14, four vanes 136 may be supported. As described above, the negative pressure pump 130 has the same configuration as the negative pressure pump 10 of the first embodiment except for the configuration of the support portion 134 and the vane 136 of the rotating shaft 132 and the arrangement position of the recess 60. The description is omitted. The support portion 134 constitutes one end side of the rotation shaft 132 in the axial direction, and a through hole 48 extends from the shaft portion 42 in the center. In addition, on the outer periphery of the support portion 134, three or more grooves (four in FIG. 14) extending in the axial direction with an interval in the circumferential direction are formed. A plate-like vane 136 is inserted and disposed in the groove 135. The vane 136 is supported by the groove wall 135 </ b> A of the groove 135 so that both plate surfaces 136 </ b> A can reciprocate in a direction perpendicular to the rotation shaft 132 (diameter direction of the rotation shaft 132). Thereby, the vane 136 rotates integrally with the rotating shaft 132 . In addition, the vane 136 rotates integrally with the rotation shaft 132, so that the end portion 136B is pressed against the inner wall surface 22A of the housing 20 by reciprocating in the diameter direction of the rotation shaft 132 by centrifugal force. Slide each. At this time, in the vane 136, one side portion in the width direction slides on the closing surface of the lid body 38, and the other side portion in the width direction slides on the bottom surface 24A. Furthermore, the vane 136 partitions the inside of the housing 20 (in the pump chamber 36) into a plurality of spaces. The space partitioned by the vane 136 is configured such that the volume gradually decreases from the suction unit 30 side toward the discharge unit 34 side as the vane 136 rotates. That is, the volume of the space partitioned by the vane 136 changes as the vane 136 rotates. The arrangement interval of the vanes 136 is set to be narrower than the interval between the suction unit 30 and the discharge unit 34 in the vane rotation direction. In other words, as shown in FIG. 14, the arrangement interval of the vanes 136 is set so that two adjacent vanes 136 are arranged between the discharge unit 34 and the suction unit 30. Further, in the negative pressure pump 130, a recess 60 is formed between the suction part 30 and the discharge part 34 in the vane rotation direction on the bottom surface 24A.
Next, the operation of the negative pressure pump 130 will be described. In the negative pressure pump 130, a recess 60 is formed between the discharge portion 34 and the suction portion 30 in the vane rotation direction on the bottom surface 24A of the housing 20. Therefore, the lubricant remaining without being discharged after the vane 136 passes through the discharge portion 34 enters the recess 60. Since the recess 60 communicates with the circular hole 32, the lubricant that has entered is guided to the circular hole 32. Here, a space between the vane 136 that has passed through the discharge unit 34 and the vane 136 that has passed through the discharge unit 34 and has not reached the suction unit 30 prior to the vane 136 (hereinafter referred to as “closed space”). .) 138 is increased in pressure due to a decrease in volume, so that the lubricant guided in the circular hole 32 is moved between the hole wall surface 32A of the circular hole 32 and the outer peripheral surface 42A of the shaft portion 42 by the pressure of the closed space 138 It is pushed into the gap. At this time, the gas remaining without being discharged is also mixed with the lubricant and pushed into the gap. Thereby, since the pressure rise of closed space 138 is suppressed, it is suppressed that an excessive pressure acts on the vane 136. FIG. As a result, the vane 136 is prevented from being damaged. Other functions and effects are the same as those of the negative pressure pump 10 of the first embodiment. The configuration of the negative pressure pump 130 may be applied to the negative pressure pump 80 of the second embodiment and the negative pressure pump portion of the cylinder head cover of the third embodiment.

Claims (8)

A casing with a bottomed cylinder, the opening is closed by a lid, and a lubricant is supplied inside, and a circular hole is formed at a position eccentric from the center of the casing at the bottom;
A shaft portion fitted in the circular hole, and a support portion having a diameter larger than that of the shaft portion and disposed in the housing and having an outer peripheral surface in contact with a part of the inner wall surface of the housing. A rotating shaft that rotates when power is transmitted from a power source;
Arranged in the housing, supported by the support portion of the rotary shaft so as to be reciprocable in a direction orthogonal to the rotary shaft, rotating integrally with the rotary shaft and sliding an end on the inner wall surface, A vane that divides the housing into a plurality of spaces;
An inhalation part formed in the housing and sucking gas into the housing;
A discharge portion that is formed downstream of the suction portion of the housing in the rotation direction of the vane and discharges the gas sucked from the suction portion and the lubricant to the outside of the housing;
The bottom surface of the casing is formed between the discharge portion and a part of the inner wall surface with which the support portion is in contact in the rotation direction of the vane, communicates with the circular hole, and is moved by the vane. A recess for guiding the lubricant to the circular hole;
Having negative pressure pump. A casing with a bottomed cylinder, the opening is closed by a lid, and a lubricant is supplied inside, and a circular hole is formed at a position eccentric from the center of the casing at the bottom;
A rotating shaft that includes a shaft portion that is fitted into the circular hole and a support portion that is larger in diameter than the shaft portion and is disposed in the housing, and that rotates when power is transmitted from a power source. When,
Arranged in the housing, supported by the support portion of the rotating shaft so as to be able to reciprocate in a direction perpendicular to the rotating shaft, and rotates integrally with the rotating shaft and the end portion slides on the inner wall surface of the housing And three or more vanes that divide the housing into a plurality of spaces,
An inhalation part formed in the housing and sucking gas into the housing;
A discharge portion that is formed downstream of the suction portion of the housing in the rotation direction of the vane and discharges the gas sucked from the suction portion and the lubricant to the outside of the housing;
The bottom surface of the housing is formed between the discharge portion and the suction portion in the rotation direction of the vane, communicates with the circular hole, and guides the lubricant moved by the vane to the circular hole. A recess to be
Having negative pressure pump.   3. The negative pressure pump according to claim 1, further comprising: a hole-side groove formed on a hole wall surface of the circular hole and communicating the recess and the outside of the housing.   4. The negative pressure pump according to claim 3, wherein the hole-side groove portion has a spiral shape that turns in the same direction as the rotation direction of the vane from the concave portion side of the circular hole toward the opposite side of the concave portion.   The negative pressure pump according to claim 1, wherein the concave portion extends from an edge portion of the circular hole to a boundary between the inner wall surface and the bottom surface. A shaft that is formed on the outer peripheral surface of the shaft portion and communicates the recess and the outside of the housing when the vane is located between the discharge portion and a part of the inner wall surface that the support portion contacts. The negative pressure pump according to claim 1, further comprising a side groove portion.   The negative pressure according to claim 6, wherein the shaft-side groove portion has a spiral shape that turns in a direction opposite to the rotation direction of the vane from the support portion side of the shaft portion toward the opposite side of the support portion. pump. With the negative pressure pump according to any one of claims 1-7, portions of which constitute the housing and the other part covers the cylinder head of the engine as the power source, a cylinder head cover.

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